num = 3
def fun():
    num = 5
    print('函数内局部变量num的值：',num)
fun()
print('函数外全局变量num的值：',num)

num = 5
def fun():
    global num
    num += 1
    print('函数内num的值：',num)
fun()
print('函数外num的值',num)

def outer():
    num = 1
    def inner():
        nonlocal num
        num = 2
        print('inner函数中num的值：',num)
    inner()
    print('outer函数中num的值：',num)
outer()

stu = [{'num':'201801','name':'王五','score': 89},
       {'num':'201802','name':'刘军','score': 95},
       {'num':'201803','name':'李梦','score': 85}]
stu.sort(key=lambda x: x['score'])
for s in stu:
    print('学号：',s['num'],'姓名:',s['name'],'成绩:',s['score'])